2004 MITSUBISHI ENDEAVOR air conditioning

Fig. 130: Identifying Connectors

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

TECHNICAL DESCRIPTION (COMMENT) If cool air is not distributed when the A/C switch is on
, the A/C com
pressor clutch

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

relay system may be defective. TROUBLESHOOTING HINTS
Improper amount of refrigerant Malfunction of the air thermo sensor Malfunction of the ambient air temperature sensor Malfunction of the A/C pressure sensor Malfunction of the A/C compressor clutch relay Malfunction of the A/C refrigerant temperature switch Malfunction of the air conditioning compressor clutch Malfunction of the A/C-ECU Malfunction of the PCM Damaged harness wires or connectors
DIAGNOSIS REQUIRED SPECIAL TOOLS:

MB991223: Test Harness Set MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.) MB991827: MUT-III USB Cable MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
STEP 1. Check the defogger and outside/inside air selection damper
control motor operation.

Q: Do the defogger and outside/inside air selection damper control motor
work normally?

YES:
Go to Step 2.
NO:
Refer to
INSPECTION PROCEDURE 10 MALFUNCTION OF
THE A/C
-ECU POWER SUPPLY SYSTEM
.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

STEP 2. Check the blower motor operation.

Q: Does the blower motor work normally?

YES:
Go to Step 3.
NO:
Refer to
INSPECTION PROCEDURE 5 BLOWER FAN AND
MOTOR DO NOT TURN
.
STEP 3. Check the A/C compressor.

Check the A/C compressor for compressor oil leaks.
Q: Is the check result satisfactory?

YES:
Go to Step 4.
NO:
Replace the A/C compressor or the expansion valve.
STEP 4. Using scan tool MB991958, read the diagnostic trouble code.

Check if an A/C-ECU DTC is set.
1. Connect scan tool MB991958 to the data link connec
tor.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 131: Connecting Scan Tool MB991958 To Data Link Connector

Courtes
y of MITSUBISHI MOTOR SALES OF AMERICA
.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

2. Turn the ignition switch to the "ON" position
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the check result satisfactory?

YES:
Go to Step 5.
NO:
Refer to
DIAGNOSTIC TROUBLE CODE CHART
.
STEP 5. Check A/C compressor clutch relay connector B-16X for loose,
corroded or damaged terminals, or terminals pushed back in the
connector.

Q: Is A/C compressor clutch relay connector B-16X in good condition?

YES:
Go to Step 6.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Check that the air conditioning works
normall
y.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 132: Locating Connector B
-16X

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 6. Check the A/C compressor clutch relay continuity.

Follow the table below to check the A/C compressor clutch relay for
continuit
y.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 133: Checking A/C Compressor Clutch Relay For Continuity

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig. 134: A/C Compressor Clutch Relay

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the A/C compressor clutch relay in good condition?

YES:
Go to Step 7.
NO:
Replace the A/C compressor clutch relay. Check that the air
conditioning works normally.
STEP 7. Check powertrain control module connector B-20 and A/C
compressor assembly B-114 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.

Q: Are powertrain control module connector B-20 and A/C compressor
assembly B-114 in good condition?

YES:
Go to Step 8.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Check that the air conditionin
g works

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor